What is the key trait associated with a 'gregarious' individual?

A 'gregarious' individual is characterized by a strong inclination toward social engagement. This term is derived from the Latin word 'gregarius,' which means 'belonging to a flock or herd,' and it captures the essence of being sociable, enjoying the company of others, and actively seeking out social interactions. Such individuals thrive in social settings and prefer to be around others rather than being alone.

In contrast, the other options present qualities that are opposite or unrelated to being gregarious. Isolation, reclusiveness, and indifference all denote a tendency to withdraw from social situations or a lack of interest in engaging with others, which starkly contrasts with the vibrant sociability that defines a gregarious person. Therefore, social engagement is the central trait that encapsulates what it means to be gregarious.